Base construction for a mast and derrick



Dec. 31, 1946. w. c. sc'RlvENl-:R ET Al. 2,413,658

BASE CONSTRUCTION FIOR A MAST AND DERRICK Filed Oct. 5, 1944 Patented Dec. 31, 1946 BAS-E CONSTRUCTION FOR A MAST AND DERRICK William CharlesScrivener and Alfred George Brewer, Sutton Coldeld, England Application October 3, 1944, Serial No. 556,977

In Great Britain June 22, 1942 The present application is a continuation-inpart of our copending application Ser. No. 483,598 led April 17, 1943, and entitled Masts, poles and the like.

This invention is for a union for connecting the lowermost member of a mast and the derrick therefor to a base plate and has for its object the provision of a union which is simple in its construction, easy to manipulate and cheap to manufacture. A

According to the present invention there is provided a union for connecting both the lowermost member of a mast and a derrick for raising the mast to a base plate which comprises means disposed between the lower ends o-f the mast and the derrick o-n the one hand and the base plate on the other, whereby the derrick and the lowermost member of the mast are swung about the same pivotal axis on the base plate when the derrick is operated to raise or lower the mast.

The invention will be hereinafter described with reference to the accompanying drawing, in which:

Figure 1 is a side elevation of a union for connecting the lowermost member of alight mast and the derriclr therefor to a base plate; and

Figure 2 is a side elevation of a union for connecting the lowermost member of a medium or heavy type of mast and the derrick therefor to a base plate.

Referring to the drawing, there are illustrated two methods of carrying the invention into effect. wherein a portion of the lowermost member of a mast or the like is shown without any guys or like supports attached thereto but it will be appreciated that such guys are necessary when the member is in an upright position and are attached at points along the lengths of the sections of a mast so as to hold the sections of the mast in the upright position.

The union illustrated in Figure 1 comprises a plate I1 having a series of upstandinq lugs I2 which are arranged in planes perpendicular to the plane of the plate I1. The lugs I2 are spaced around the plate I1 at distances corresponding to the distances between slots 8 formed in a flange 1 of a spigot 9 which extends into the lowermost member 6 of the mast. The distances of the slots from the axis of the said member correspond to the distances of the lugs I2 from the said axis and the lugs I2 on the plate I1 are so shaped that they are provided with portions I3 which overhang the plate in a direction towards the axis thereof and also the iiange 1 in a manner hereinafter described.

In the construction illustrated in Figure 1, the

plate I1 is mounted upon two upwardly extending arms I 8 pivotally mounted upon a block I9 which is pivotally mounted in a -bracket 29 carried by a base plate 2|. The block I9 is so mounted as to be rotatable about an axis at right angles to the axis about which the arms I8 pivot relatively to the block I9.

Connected to the block I9 is a yoke 29A which is arranged to swing about the axis of the block I9. The yoke 29A carries a second plate I1A pivotally connected to the yoke 20A by a swivel pin 22 whose axis is directed at right angles to the axis about which the yoke swivels about the block I9. The second plate I'IA is also provided with outwardly extending lugs I2 and is arranged to receive the flanged end of a member similar to the lowermost member 6 ofthe mast. The said member is arranged to act as a derrick in the erection and lowering of the mast.

The lowermost member 6 of the mast and the member which operates as a derrick are connected to their respective plates I1 and I1A in a similar manner, the connection corresponding to the ordinary movement of a bayonet joint. Thus for example both the member and the derrick are connected to a base plate by a longitudinal movement of the member B or the derrick until the lugs I2 extend through the slots 8 in .the flanges 1 whereupon the member or the derrick is given a part rotational movement about its axis so as to bring the iiange 1 beneath the overharging portions I3 of the lugs I2. A split pin 23 is then inserted through a slot 8 into a hole in the plate I1 or I1A as the case may be so as to lock the member B or derrick to the plate I1 or The connection between the lowermost member of a mast and the derrick therefor tO a base plate which has been described with reference to Figure 1 is suitable for connecting a light mast and its derrick to a base but where medium and heavy masts are employed and the members are in consequence made `of a heavier construction. it is found desirable to substitute for the union hereinbefore referred to a union which is preferably constructed so as to ensure that the compression loading is applied concentrically to the ends of the members.

One form of such a union is illustrated in Figure 2 and comprises a socket 50 arranged to receive the lowermost member 52 of a mast. The base plate 5I is provided with a pair of upwardly extending brackets 56 arranged to receive between their iree ends a block 55 which is carried by pivots 51 rotatably mounted in the brackets ceive pivots 58 which extend into the block '55' so as to enable the lowermost member 52 to swivel about the same.

By means of a union constructed in the above manner, it will be oberved Ithat'th'e end .of the lowermost member 52 is connected to the base .plate in a manner which permits of alimitedfree movement in all directions of the said member l relatively to the base plate and yet the pivots are such as to prevent any substantial .longitudinal movement of the lowermost member an'd the'base `plate relatively to one another.

The union illustrated in Figure 2 may be con- -nected to a derrick ina manner corresponding to that indicated in Figure 1 or in place of the pla-te VIIA there may be employed a socket 59 corresponding to the socket 50 illustrated in Figure 2 which .is arranged to sWingabout the same axis yasfthe pivots 57 -so that as the mast is being raised and lowered so the derrick is lowered and raised about the same axis.

.It will be appreciated that in `view of the fact that the derricl:` can swivel about two axes at right angles to one another thel derrick may be laid, before the mast is raised,along the ground, so as to extend in a direction atright angles to the lowermost'member of the mast. Such an arrangement `facilitates the connection of forward guy ropes of avmast to the free end of the derrick What we claim as our invention and desire to secure by LettersPatent-of the UnitedStates 1. A union for connecting both the lowermost member of a mast and the lowermost member of a derrick employed for raising said mast for pivotal movement of said mast and derrick about a. common pivotal axis and for pivotal movement of said derrick about an axis at right angles to said common Ypivotal axis, said union comprising a base plate, means disposed between said lowerm-ost members and said base plate and constituting the common pivotal axis for said mast and derrick, and means disposed between said com-v nron'pivotal 'axis andvsaid lowermost member of said derrick and constituting the pivotal axis for said.derrick,.said last mentioned pivotal axis beingliisposed at right angles -to said common pivotal axis.

`T2. vAxunion A'for vconnecting both the lowermost member of a mast and the lowermost member of a 'derrick employed for raising said mast for pivotal movement of said mast and derrick about a common pivotal axis and for pivotal movement 'of said mast -and-derrick aboutseparate axes disposed-at right Yangles to said common axis, said union comprising a base plate, means disposed between said .lowermost members :and said base plateand constituting the common axis for said mast and derrick, means vdisposed between said .common pivotal axis and said lowermost memlber of said mast and constituting thepivotal axis for said mast, saidlast mentioned pivotal axis being disposed at right angles to said common pivotal axis, and means disposed between said `common pivotal-axis and saidlowermost member of said derrick and constituting the pivotal axis for said derrick, saidilast vmentioned pivotal axis being disposed at right angles to said common pivotal axis.

lWILLIAM VCHARLES SCRIVENER. ALFRED GEORGE BREWER. 

